홈
제품
Red Hat build of Apache Camel
4.10
Red Hat build of Apache Camel for Spring Boot Reference
Chapter 39. Flink

이 콘텐츠는 선택한 언어로 제공되지 않습니다.

Chapter 39. Flink

Since Camel 2.18

Only producer is supported

This documentation page covers the Flink component for the Apache Camel. The camel-flink component provides a bridge between Camel components and Flink tasks. This component provides a way to route a message from various transports, dynamically choosing a flink task to execute, use an incoming message as input data for the task and finally deliver the results back to the Camel pipeline.

39.1. Dependencies
링크 복사

When using camel-flink with Red Hat build of Camel Spring Boot, add the following Maven dependency to your pom.xml to have support for auto configuration:

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-flink-starter</artifactId>
</dependency>

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-flink-starter</artifactId>
</dependency>

Copy to Clipboard

Toggle word wrap

39.2. URI Format
링크 복사

Currently, the Flink Component supports only Producers. One can create DataSet, DataStream jobs.

flink:dataset?dataset=#myDataSet&dataSetCallback=#dataSetCallback
flink:datastream?datastream=#myDataStream&dataStreamCallback=#dataStreamCallback

flink:dataset?dataset=#myDataSet&dataSetCallback=#dataSetCallback
flink:datastream?datastream=#myDataStream&dataStreamCallback=#dataStreamCallback

Copy to Clipboard

Toggle word wrap

39.3. Configuring Options
링크 복사

Camel components are configured on two separate levels:

component level
endpoint level

39.3.1. Configuring Component Options
링크 복사

At the component level, you set general and shared configurations that are, then, inherited by the endpoints. It is the highest configuration level. For example, a component may have security settings, credentials for authentication, urls for network connection and so forth. Some components only have a few options, and others may have many. Because components typically have pre-configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

You can configure components using:

the Component DSL.
in a configuration file (application.properties, *.yaml files, etc).
directly in the Java code.

39.3.2. Configuring Endpoint Options
링크 복사

You usually spend more time setting up endpoints because they have many options. These options help you customize what you want the endpoint to do. The options are also categorized into whether the endpoint is used as a consumer (from), as a producer (to), or both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java.

A good practice when configuring options is to use Property Placeholders.

Property placeholders provide a few benefits:

They help prevent using hardcoded urls, port numbers, sensitive information, and other settings.
They allow externalizing the configuration from the code.
They help the code to become more flexible and reusable.

The following two sections list all the options, firstly for the component followed by the endpoint.

39.4. Component Options
링크 복사

The Flink component supports 5 options, which are listed below.

Expand

Name	Description	Default	Type
dataSetCallback (producer)	Function performing action against a DataSet.		DataSetCallback
dataStream (producer)	DataStream to compute against.		DataStream
dataStreamCallback (producer)	Function performing action against a DataStream.		DataStreamCallback
lazyStartProducer (producer)	Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.	false	boolean
autowiredEnabled (advanced)	Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.	true	boolean

39.5. Endpoint Options
링크 복사

The Flink endpoint is configured using URI syntax:

flink:endpointType

flink:endpointType

Copy to Clipboard

Toggle word wrap

With the following path and query parameters:

39.5.1. Path Parameters (1 parameters)
링크 복사

Expand

Name	Description	Default	Type
endpointType (producer)	Required Type of the endpoint (dataset, datastream). Enum values: dataset datastream		EndpointType

Name

Description

Default

Type

endpointType (producer)

Required Type of the endpoint (dataset, datastream).

Enum values:

dataset
datastream

EndpointType

39.5.2. Query Parameters (6 parameters)
링크 복사

Expand

Name	Description	Default	Type
collect (producer)	Indicates if results should be collected or counted.	true	boolean
dataSet (producer)	DataSet to compute against.		DataSet
dataSetCallback (producer)	Function performing action against a DataSet.		DataSetCallback
dataStream (producer)	DataStream to compute against.		DataStream
dataStreamCallback (producer)	Function performing action against a DataStream.		DataStreamCallback
lazyStartProducer (producer (advanced))	Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.	false	boolean

39.6. Message Headers
링크 복사

The Flink component supports 4 message header(s), which is/are listed below:

Expand

Name	Description	Type
CamelFlinkDataSet (producer) Constant: FLINK_DATASET_HEADER	The dataset.	Object
CamelFlinkDataSetCallback (producer) Constant: FLINK_DATASET_CALLBACK_HEADER	The dataset callback.	DataSetCallback
CamelFlinkDataStream (producer) Constant:FLINK_DATASTREAM_HEADER	The data stream.	Object
CamelFlinkDataStreamCallback (producer) Constant:FLINK_DATASTREAM_CALLBACK_HEADER	The data stream callback.	DataStreamCallback

39.7. Flink DataSet Callback
링크 복사

@Bean
public DataSetCallback<Long> dataSetCallback() {
    return new DataSetCallback<Long>() {
        public Long onDataSet(DataSet dataSet, Object... objects) {
            try {
                 dataSet.print();
                 return new Long(0);
            } catch (Exception e) {
                 return new Long(-1);
            }
        }
    };
}

@Bean
public DataSetCallback<Long> dataSetCallback() {
    return new DataSetCallback<Long>() {
        public Long onDataSet(DataSet dataSet, Object... objects) {
            try {
                 dataSet.print();
                 return new Long(0);
            } catch (Exception e) {
                 return new Long(-1);
            }
        }
    };
}

Copy to Clipboard

Toggle word wrap

39.8. Flink DataStream Callback
링크 복사

@Bean
public VoidDataStreamCallback dataStreamCallback() {
    return new VoidDataStreamCallback() {
        @Override
        public void doOnDataStream(DataStream dataStream, Object... objects) throws Exception {
            dataStream.flatMap(new Splitter()).print();

            environment.execute("data stream test");
        }
    };
}

@Bean
public VoidDataStreamCallback dataStreamCallback() {
    return new VoidDataStreamCallback() {
        @Override
        public void doOnDataStream(DataStream dataStream, Object... objects) throws Exception {
            dataStream.flatMap(new Splitter()).print();

            environment.execute("data stream test");
        }
    };
}

Copy to Clipboard

Toggle word wrap

39.9. Camel-Flink Producer call
링크 복사

CamelContext camelContext = new SpringCamelContext(context);

String pattern = "foo";

try {
    ProducerTemplate template = camelContext.createProducerTemplate();
    camelContext.start();
    Long count = template.requestBody("flink:dataSet?dataSet=#myDataSet&dataSetCallback=#countLinesContaining", pattern, Long.class);
    } finally {
        camelContext.stop();
    }

CamelContext camelContext = new SpringCamelContext(context);

String pattern = "foo";

try {
    ProducerTemplate template = camelContext.createProducerTemplate();
    camelContext.start();
    Long count = template.requestBody("flink:dataSet?dataSet=#myDataSet&dataSetCallback=#countLinesContaining", pattern, Long.class);
    } finally {
        camelContext.stop();
    }

Copy to Clipboard

Toggle word wrap

39.10. Spring Boot Auto-Configuration
링크 복사

The component supports 6 options, which are listed below.

Expand

Name	Description	Default	Type
camel.component.flink.autowired-enabled	Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.	true	Boolean
camel.component.flink.data-set-callback	Function performing action against a DataSet. The option is a org.apache.camel.component.flink.DataSetCallback type.		DataSetCallback
camel.component.flink.data-stream	DataStream to compute against. The option is a org.apache.flink.streaming.api.datastream.DataStream type.		DataStream
camel.component.flink.data-stream-callback	Function performing action against a DataStream. The option is a org.apache.camel.component.flink.DataStreamCallback type.		DataStreamCallback
camel.component.flink.enabled	Whether to enable auto configuration of the flink component. This is enabled by default.		Boolean
camel.component.flink.lazy-start-producer	Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.	false	Boolean

이 콘텐츠는 선택한 언어로 제공되지 않습니다.

Chapter 39. Flink

39.1. Dependencies
링크 복사

39.2. URI Format
링크 복사

39.3. Configuring Options
링크 복사

39.3.1. Configuring Component Options
링크 복사

39.3.2. Configuring Endpoint Options
링크 복사

39.4. Component Options
링크 복사

39.5. Endpoint Options
링크 복사

39.5.1. Path Parameters (1 parameters)
링크 복사

39.5.2. Query Parameters (6 parameters)
링크 복사

39.6. Message Headers
링크 복사

39.7. Flink DataSet Callback
링크 복사

39.8. Flink DataStream Callback
링크 복사

39.9. Camel-Flink Producer call
링크 복사

39.10. Spring Boot Auto-Configuration
링크 복사

자세한 정보

평가판, 구매 및 판매

커뮤니티

Red Hat 문서 정보

보다 포괄적 수용을 위한 오픈 소스 용어 교체

Red Hat 소개

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

이 콘텐츠는 선택한 언어로 제공되지 않습니다.

Chapter 39. Flink

39.1. Dependencies링크 복사링크가 클립보드에 복사되었습니다!

39.2. URI Format링크 복사링크가 클립보드에 복사되었습니다!

39.3. Configuring Options링크 복사링크가 클립보드에 복사되었습니다!

39.3.1. Configuring Component Options링크 복사링크가 클립보드에 복사되었습니다!

39.3.2. Configuring Endpoint Options링크 복사링크가 클립보드에 복사되었습니다!

39.4. Component Options링크 복사링크가 클립보드에 복사되었습니다!

39.5. Endpoint Options링크 복사링크가 클립보드에 복사되었습니다!

39.5.1. Path Parameters (1 parameters)링크 복사링크가 클립보드에 복사되었습니다!

39.5.2. Query Parameters (6 parameters)링크 복사링크가 클립보드에 복사되었습니다!

39.6. Message Headers링크 복사링크가 클립보드에 복사되었습니다!

39.7. Flink DataSet Callback링크 복사링크가 클립보드에 복사되었습니다!

39.8. Flink DataStream Callback링크 복사링크가 클립보드에 복사되었습니다!

39.9. Camel-Flink Producer call링크 복사링크가 클립보드에 복사되었습니다!

39.10. Spring Boot Auto-Configuration링크 복사링크가 클립보드에 복사되었습니다!

자세한 정보

평가판, 구매 및 판매

커뮤니티

Red Hat 문서 정보

보다 포괄적 수용을 위한 오픈 소스 용어 교체

Red Hat 소개

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

39.1. Dependencies
링크 복사

39.2. URI Format
링크 복사

39.3. Configuring Options
링크 복사

39.3.1. Configuring Component Options
링크 복사

39.3.2. Configuring Endpoint Options
링크 복사

39.4. Component Options
링크 복사

39.5. Endpoint Options
링크 복사

39.5.1. Path Parameters (1 parameters)
링크 복사

39.5.2. Query Parameters (6 parameters)
링크 복사

39.6. Message Headers
링크 복사

39.7. Flink DataSet Callback
링크 복사

39.8. Flink DataStream Callback
링크 복사

39.9. Camel-Flink Producer call
링크 복사

39.10. Spring Boot Auto-Configuration
링크 복사